Method for preparing precursor of positive electrode active material for lithium ion battery

The invention relates to a method for producing a particulate (oxy) hydroxide of TM, where TM represents a combination of metals, and where TM comprises nickel and at least one metal selected from cobalt, aluminum and manganese, wherein the process comprises the steps of: (a) combining an aqueous slurry of metallic nickel and at least one metal selected from the group consisting of aluminum and transition metals other than nickel with an oxidizing agent selected from the group consisting of oxygen and nitrates in a first reaction vessel or a first group of reaction vessels at a temperature of 5-40 DEG C, (b) transferring the aqueous reaction medium from the first reaction vessel to a second reaction vessel, where the second reaction vessel comprises a slurry of a hydroxide of TM, where the pH in step (b) is higher than step (a) and the temperature is from 45 to 80 DEG C, thereby forming and growing particles of the hydroxide of TM, (c) removing the particles from step (b) from the liquid by a solid-liquid sep